Fix T86746: Description missing from Quick Liquid

The description was missing from the Quick Liquid operator.

The fix adds the following description:
"Make selected objects liquid"

Reviewed By: sebbas

Maniphest Tasks: T86746

Differential Revision: https://developer.blender.org/D10777

release/scripts/startup/bl_operators/object_quick_effects.py

@@ -441,6 +441,7 @@ class QuickSmoke(ObjectModeOperator, Operator):
 
 
 class QuickLiquid(Operator):
+    """Make selected objects liquid"""
     bl_idname = "object.quick_liquid"
     bl_label = "Quick Liquid"
     bl_options = {'REGISTER', 'UNDO'}